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The injector ground circuit must not be working. What causes the pulse is when the computer internally grounds the injector circuit, power is passed across the injector solenoid terminals. All the injector grounds are spliced together on each bank of engine, and run into the computer. So, injector power, but no pulsing would seem a computer malfunction as long as the ground wires are good. Did you check all the injectors for pulse with the noid light, or at least both sides of engine?
what vehicle? injector pulse controlled by computer. the computer recieves a pulse from crank angle sensor, or distributor pick up, etc. then controls injector pulse. Mass air flow on some vehicles determines spray pattern
Don't know. Either a malfunction internally in the ecu, or bad wires from ecu to injectors. You could pull off the ecu connector and check for continuity on the wires from ecu to the two injectors. If the power.wires are not broken and show low resistance, check both ground wires from the two injectors to ecu for continuity. If the wires are good, it must be the ecu.
1991 this make you OBD1 . You can access a code by jumping 2 terminals together.The injector pulse is from the PCM . If you have no pulse you need to troubleshoot for spark first . If you dont have spark do spark first then injector pulse comes on. If no injector pulse check fuse in engine junction box.Use a volt meter check grounds at PCM. If all else checks out good replace PCM. You may also want to check the TPS. If this sensor short out in the WOT position you also wont get injector pulse.SO disconnect the TPS. and recheck for injector pulse
sounds like u got no injector pulse comin from ecm.we need to pull ecm codes an review them ,possible camshaft sensors faulty they usually provide reference pulses to ecm for injector firing or pulse.without this pulse ur injectors will never open up to let fuel enter combustion chamber. one way of checking pulse is to connect a noid light(small light bulb that plugs in injector pigtail to chek for power to injector and ur pulsing ground coming from ecm to injector) an test for a blinking light while cranking engine.
Ohm meter is not a reliable test for an oxygen sensor, the output of which should be tested with a bar type digital voltmeter so the voltage pulses can clearly be seen.
In theory at least, the required idle speed is programmed into the management computer which should be maintained by varying the ignition timing and the idle air valve.
In the absence of other faults a failure to idle could indicate a faulty or sticking idle air valve.
It is wise to check for such things as intake air leaks and basic engine settings, breather system...
Considering the age, if nothing else is found it would be wise to suspect the injector spray patterns.
check to make sure the fuel pump,injectors and fuel pressure regulator don't have any internal leaks check the fuel pressure immediatlly after it is shut off and two hours later there should be at most a very slight difference
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